Wich is right " it's a constant or it's an constant" ?

March 27, 2017
#$%@4-
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King Bapu
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800
![]() both are wrong
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#$%@4-
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189
![]() u don't use an without vowel
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#$%@4-
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0
![]() an egg or a egg
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#$%@4-
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1
![]() it's constanly
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